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Finding the Fourth Proportional to 324.76, 485.21 and 321.88

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Solution

The fourth proportional to 324.76, 485.21 and 321.88 is: 480.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.76 : 485.21 = 321.88 : x
  2. Step 2: Convert to fraction form
    324.76/485.21 = 321.88/x
  3. Step 3: Cross multiply
    324.76x = 485.21 × 321.88
  4. Step 4: Simplify right side
    324.76x = 156,179.39
  5. Step 5: Solve for x
    x = 156,179.39/324.76
  6. Step 6: Final answer
    x = 480.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.